Locking device



FIG. 1 is a perspective view of a locking device showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is another side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The claim has been shown broken away for ease of illustration to show indeterminate length. 

The ornamental design for a locking device, as shown and described. 